github.com/afumu/libc@v0.0.6/musl/include/arpa/nameser.h

#ifndef _ARPA_NAMESER_H
#define _ARPA_NAMESER_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stddef.h>
#include <stdint.h>

#define __NAMESER	19991006
#define NS_PACKETSZ	512
#define NS_MAXDNAME	1025
#define NS_MAXMSG	65535
#define NS_MAXCDNAME	255
#define NS_MAXLABEL	63
#define NS_HFIXEDSZ	12
#define NS_QFIXEDSZ	4
#define NS_RRFIXEDSZ	10
#define NS_INT32SZ	4
#define NS_INT16SZ	2
#define NS_INT8SZ	1
#define NS_INADDRSZ	4
#define NS_IN6ADDRSZ	16
#define NS_CMPRSFLGS	0xc0
#define NS_DEFAULTPORT	53

typedef enum __ns_sect {
	ns_s_qd = 0,
	ns_s_zn = 0,
	ns_s_an = 1,
	ns_s_pr = 1,
	ns_s_ns = 2,
	ns_s_ud = 2,
	ns_s_ar = 3,
	ns_s_max = 4
} ns_sect;

typedef struct __ns_msg {
	const unsigned char *_msg, *_eom;
	uint16_t _id, _flags, _counts[ns_s_max];
	const unsigned char *_sections[ns_s_max];
	ns_sect _sect;
	int _rrnum;
	const unsigned char *_msg_ptr;
} ns_msg;

struct _ns_flagdata {  int mask, shift;  };
extern const struct _ns_flagdata _ns_flagdata[];

#define ns_msg_id(handle) ((handle)._id + 0)
#define ns_msg_base(handle) ((handle)._msg + 0)
#define ns_msg_end(handle) ((handle)._eom + 0)
#define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
#define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
#define ns_msg_getflag(handle, flag) \
	(((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift)

typedef	struct __ns_rr {
	char		name[NS_MAXDNAME];
	uint16_t	type;
	uint16_t	rr_class;
	uint32_t	ttl;
	uint16_t	rdlength;
	const unsigned char *rdata;
} ns_rr;

#define ns_rr_name(rr)	(((rr).name[0] != '\0') ? (rr).name : ".")
#define ns_rr_type(rr)	((ns_type)((rr).type + 0))
#define ns_rr_class(rr)	((ns_class)((rr).rr_class + 0))
#define ns_rr_ttl(rr)	((rr).ttl + 0)
#define ns_rr_rdlen(rr)	((rr).rdlength + 0)
#define ns_rr_rdata(rr)	((rr).rdata + 0)

typedef enum __ns_flag {
	ns_f_qr,
	ns_f_opcode,
	ns_f_aa,
	ns_f_tc,
	ns_f_rd,
	ns_f_ra,
	ns_f_z,
	ns_f_ad,
	ns_f_cd,
	ns_f_rcode,
	ns_f_max
} ns_flag;

typedef enum __ns_opcode {
	ns_o_query = 0,
	ns_o_iquery = 1,
	ns_o_status = 2,
	ns_o_notify = 4,
	ns_o_update = 5,
	ns_o_max = 6
} ns_opcode;

typedef	enum __ns_rcode {
	ns_r_noerror = 0,
	ns_r_formerr = 1,
	ns_r_servfail = 2,
	ns_r_nxdomain = 3,
	ns_r_notimpl = 4,
	ns_r_refused = 5,
	ns_r_yxdomain = 6,
	ns_r_yxrrset = 7,
	ns_r_nxrrset = 8,
	ns_r_notauth = 9,
	ns_r_notzone = 10,
	ns_r_max = 11,
	ns_r_badvers = 16,
	ns_r_badsig = 16,
	ns_r_badkey = 17,
	ns_r_badtime = 18
} ns_rcode;

typedef enum __ns_update_operation {
	ns_uop_delete = 0,
	ns_uop_add = 1,
	ns_uop_max = 2
} ns_update_operation;

struct ns_tsig_key {
        char name[NS_MAXDNAME], alg[NS_MAXDNAME];
        unsigned char *data;
        int len;
};
typedef struct ns_tsig_key ns_tsig_key;

struct ns_tcp_tsig_state {
	int counter;
	struct dst_key *key;
	void *ctx;
	unsigned char sig[NS_PACKETSZ];
	int siglen;
};
typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;

#define NS_TSIG_FUDGE 300
#define NS_TSIG_TCP_COUNT 100
#define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"

#define NS_TSIG_ERROR_NO_TSIG -10
#define NS_TSIG_ERROR_NO_SPACE -11
#define NS_TSIG_ERROR_FORMERR -12

typedef enum __ns_type {
	ns_t_invalid = 0,
	ns_t_a = 1,
	ns_t_ns = 2,
	ns_t_md = 3,
	ns_t_mf = 4,
	ns_t_cname = 5,
	ns_t_soa = 6,
	ns_t_mb = 7,
	ns_t_mg = 8,
	ns_t_mr = 9,
	ns_t_null = 10,
	ns_t_wks = 11,
	ns_t_ptr = 12,
	ns_t_hinfo = 13,
	ns_t_minfo = 14,
	ns_t_mx = 15,
	ns_t_txt = 16,
	ns_t_rp = 17,
	ns_t_afsdb = 18,
	ns_t_x25 = 19,
	ns_t_isdn = 20,
	ns_t_rt = 21,
	ns_t_nsap = 22,
	ns_t_nsap_ptr = 23,
	ns_t_sig = 24,
	ns_t_key = 25,
	ns_t_px = 26,
	ns_t_gpos = 27,
	ns_t_aaaa = 28,
	ns_t_loc = 29,
	ns_t_nxt = 30,
	ns_t_eid = 31,
	ns_t_nimloc = 32,
	ns_t_srv = 33,
	ns_t_atma = 34,
	ns_t_naptr = 35,
	ns_t_kx = 36,
	ns_t_cert = 37,
	ns_t_a6 = 38,
	ns_t_dname = 39,
	ns_t_sink = 40,
	ns_t_opt = 41,
	ns_t_apl = 42,
	ns_t_tkey = 249,
	ns_t_tsig = 250,
	ns_t_ixfr = 251,
	ns_t_axfr = 252,
	ns_t_mailb = 253,
	ns_t_maila = 254,
	ns_t_any = 255,
	ns_t_zxfr = 256,
	ns_t_max = 65536
} ns_type;

#define	ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
		      (t) == ns_t_mailb || (t) == ns_t_maila)
#define	ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
#define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
#define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
#define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
		       (t) == ns_t_zxfr)

typedef enum __ns_class {
	ns_c_invalid = 0,
	ns_c_in = 1,
	ns_c_2 = 2,
	ns_c_chaos = 3,
	ns_c_hs = 4,
	ns_c_none = 254,
	ns_c_any = 255,
	ns_c_max = 65536
} ns_class;

typedef enum __ns_key_types {
	ns_kt_rsa = 1,
	ns_kt_dh  = 2,
	ns_kt_dsa = 3,
	ns_kt_private = 254
} ns_key_types;

typedef enum __ns_cert_types {
	cert_t_pkix = 1,
	cert_t_spki = 2,
	cert_t_pgp  = 3,
	cert_t_url  = 253,
	cert_t_oid  = 254
} ns_cert_types;

#define	NS_KEY_TYPEMASK		0xC000
#define	NS_KEY_TYPE_AUTH_CONF	0x0000
#define	NS_KEY_TYPE_CONF_ONLY	0x8000
#define	NS_KEY_TYPE_AUTH_ONLY	0x4000
#define	NS_KEY_TYPE_NO_KEY	0xC000
#define	NS_KEY_NO_AUTH		0x8000
#define	NS_KEY_NO_CONF		0x4000
#define	NS_KEY_RESERVED2	0x2000
#define	NS_KEY_EXTENDED_FLAGS	0x1000
#define	NS_KEY_RESERVED4	0x0800
#define	NS_KEY_RESERVED5	0x0400
#define	NS_KEY_NAME_TYPE	0x0300
#define	NS_KEY_NAME_USER	0x0000
#define	NS_KEY_NAME_ENTITY	0x0200
#define	NS_KEY_NAME_ZONE	0x0100
#define	NS_KEY_NAME_RESERVED	0x0300
#define	NS_KEY_RESERVED8	0x0080
#define	NS_KEY_RESERVED9	0x0040
#define	NS_KEY_RESERVED10	0x0020
#define	NS_KEY_RESERVED11	0x0010
#define	NS_KEY_SIGNATORYMASK	0x000F
#define	NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
				  NS_KEY_RESERVED4 | \
				  NS_KEY_RESERVED5 | \
				  NS_KEY_RESERVED8 | \
				  NS_KEY_RESERVED9 | \
				  NS_KEY_RESERVED10 | \
				  NS_KEY_RESERVED11 )
#define NS_KEY_RESERVED_BITMASK2 0xFFFF
#define	NS_ALG_MD5RSA		1
#define	NS_ALG_DH               2
#define	NS_ALG_DSA              3
#define	NS_ALG_DSS              NS_ALG_DSA
#define	NS_ALG_EXPIRE_ONLY	253
#define	NS_ALG_PRIVATE_OID	254

#define NS_KEY_PROT_TLS         1
#define NS_KEY_PROT_EMAIL       2
#define NS_KEY_PROT_DNSSEC      3
#define NS_KEY_PROT_IPSEC       4
#define NS_KEY_PROT_ANY		255

#define	NS_MD5RSA_MIN_BITS	 512
#define	NS_MD5RSA_MAX_BITS	4096
#define	NS_MD5RSA_MAX_BYTES	((NS_MD5RSA_MAX_BITS+7/8)*2+3)
#define	NS_MD5RSA_MAX_BASE64	(((NS_MD5RSA_MAX_BYTES+2)/3)*4)
#define NS_MD5RSA_MIN_SIZE	((NS_MD5RSA_MIN_BITS+7)/8)
#define NS_MD5RSA_MAX_SIZE	((NS_MD5RSA_MAX_BITS+7)/8)

#define NS_DSA_SIG_SIZE         41
#define NS_DSA_MIN_SIZE         213
#define NS_DSA_MAX_BYTES        405

#define	NS_SIG_TYPE	0
#define	NS_SIG_ALG	2
#define	NS_SIG_LABELS	3
#define	NS_SIG_OTTL	4
#define	NS_SIG_EXPIR	8
#define	NS_SIG_SIGNED	12
#define	NS_SIG_FOOT	16
#define	NS_SIG_SIGNER	18
#define	NS_NXT_BITS 8
#define	NS_NXT_BIT_SET(  n,p) (p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
#define	NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
#define	NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
#define NS_NXT_MAX 127

#define NS_OPT_DNSSEC_OK        0x8000U
#define NS_OPT_NSID		3

#define NS_GET16(s, cp) (void)((s) = ns_get16(((cp)+=2)-2))
#define NS_GET32(l, cp) (void)((l) = ns_get32(((cp)+=4)-4))
#define NS_PUT16(s, cp) ns_put16((s), ((cp)+=2)-2)
#define NS_PUT32(l, cp) ns_put32((l), ((cp)+=4)-4)

unsigned ns_get16(const unsigned char *);
unsigned long ns_get32(const unsigned char *);
void ns_put16(unsigned, unsigned char *);
void ns_put32(unsigned long, unsigned char *);

int ns_initparse(const unsigned char *, int, ns_msg *);
int ns_parserr(ns_msg *, ns_sect, int, ns_rr *);
int ns_skiprr(const unsigned char *, const unsigned char *, ns_sect, int);
int ns_name_uncompress(const unsigned char *, const unsigned char *, const unsigned char *, char *, size_t);


#define	__BIND		19950621

typedef struct {
	unsigned	id :16;
#if __BYTE_ORDER == __BIG_ENDIAN
	unsigned	qr: 1;
	unsigned	opcode: 4;
	unsigned	aa: 1;
	unsigned	tc: 1;
	unsigned	rd: 1;
	unsigned	ra: 1;
	unsigned	unused :1;
	unsigned	ad: 1;
	unsigned	cd: 1;
	unsigned	rcode :4;
#else
	unsigned	rd :1;
	unsigned	tc :1;
	unsigned	aa :1;
	unsigned	opcode :4;
	unsigned	qr :1;
	unsigned	rcode :4;
	unsigned	cd: 1;
	unsigned	ad: 1;
	unsigned	unused :1;
	unsigned	ra :1;
#endif
	unsigned	qdcount :16;
	unsigned	ancount :16;
	unsigned	nscount :16;
	unsigned	arcount :16;
} HEADER;

#define PACKETSZ	NS_PACKETSZ
#define MAXDNAME	NS_MAXDNAME
#define MAXCDNAME	NS_MAXCDNAME
#define MAXLABEL	NS_MAXLABEL
#define	HFIXEDSZ	NS_HFIXEDSZ
#define QFIXEDSZ	NS_QFIXEDSZ
#define RRFIXEDSZ	NS_RRFIXEDSZ
#define	INT32SZ		NS_INT32SZ
#define	INT16SZ		NS_INT16SZ
#define INT8SZ		NS_INT8SZ
#define	INADDRSZ	NS_INADDRSZ
#define	IN6ADDRSZ	NS_IN6ADDRSZ
#define	INDIR_MASK	NS_CMPRSFLGS
#define NAMESERVER_PORT	NS_DEFAULTPORT

#define S_ZONE		ns_s_zn
#define S_PREREQ	ns_s_pr
#define S_UPDATE	ns_s_ud
#define S_ADDT		ns_s_ar

#define QUERY		ns_o_query
#define IQUERY		ns_o_iquery
#define STATUS		ns_o_status
#define	NS_NOTIFY_OP	ns_o_notify
#define	NS_UPDATE_OP	ns_o_update

#define NOERROR		ns_r_noerror
#define FORMERR		ns_r_formerr
#define SERVFAIL	ns_r_servfail
#define NXDOMAIN	ns_r_nxdomain
#define NOTIMP		ns_r_notimpl
#define REFUSED		ns_r_refused
#define YXDOMAIN	ns_r_yxdomain
#define YXRRSET		ns_r_yxrrset
#define NXRRSET		ns_r_nxrrset
#define NOTAUTH		ns_r_notauth
#define NOTZONE		ns_r_notzone

#define DELETE		ns_uop_delete
#define ADD		ns_uop_add

#define T_A		ns_t_a
#define T_NS		ns_t_ns
#define T_MD		ns_t_md
#define T_MF		ns_t_mf
#define T_CNAME		ns_t_cname
#define T_SOA		ns_t_soa
#define T_MB		ns_t_mb
#define T_MG		ns_t_mg
#define T_MR		ns_t_mr
#define T_NULL		ns_t_null
#define T_WKS		ns_t_wks
#define T_PTR		ns_t_ptr
#define T_HINFO		ns_t_hinfo
#define T_MINFO		ns_t_minfo
#define T_MX		ns_t_mx
#define T_TXT		ns_t_txt
#define	T_RP		ns_t_rp
#define T_AFSDB		ns_t_afsdb
#define T_X25		ns_t_x25
#define T_ISDN		ns_t_isdn
#define T_RT		ns_t_rt
#define T_NSAP		ns_t_nsap
#define T_NSAP_PTR	ns_t_nsap_ptr
#define	T_SIG		ns_t_sig
#define	T_KEY		ns_t_key
#define	T_PX		ns_t_px
#define	T_GPOS		ns_t_gpos
#define	T_AAAA		ns_t_aaaa
#define	T_LOC		ns_t_loc
#define	T_NXT		ns_t_nxt
#define	T_EID		ns_t_eid
#define	T_NIMLOC	ns_t_nimloc
#define	T_SRV		ns_t_srv
#define T_ATMA		ns_t_atma
#define T_NAPTR		ns_t_naptr
#define T_A6		ns_t_a6
#define T_DNAME		ns_t_dname
#define	T_TSIG		ns_t_tsig
#define	T_IXFR		ns_t_ixfr
#define T_AXFR		ns_t_axfr
#define T_MAILB		ns_t_mailb
#define T_MAILA		ns_t_maila
#define T_ANY		ns_t_any

#define C_IN		ns_c_in
#define C_CHAOS		ns_c_chaos
#define C_HS		ns_c_hs
#define C_NONE		ns_c_none
#define C_ANY		ns_c_any

#define	GETSHORT		NS_GET16
#define	GETLONG			NS_GET32
#define	PUTSHORT		NS_PUT16
#define	PUTLONG			NS_PUT32

#ifdef __cplusplus
}
#endif

#endif